This standard applies to flanged globe-style control valves@ sizes 15 mm (1/2 inch) through 450 mm (18 inches)@ having top@ top and bottom@ port@ or cage guiding. Purpose The purpose of this standard is to aid users in their piping design by providing Classes 900@ 1500@ and 2500@ flanged globe-style control valve dimensions@ without giving special consideration to the equipment manufacturer to be used. The short-long dimensions provided in Table 1 clarify 2.1 by consolidating the diversity of existing manufacturers' lengths into two sets of dimensions for each valve size. Before using either the short or long dimension@ the piping designer should confirm with the selected valve manufacturer which dimension is correct for the valve(s) being supplied.